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-rw-r--r--meta/recipes-connectivity/wpa-supplicant/wpa-supplicant/0001-AP-WMM-Fix-integer-underflow-in-WMM-Action-frame-par.patch45
1 files changed, 45 insertions, 0 deletions
diff --git a/meta/recipes-connectivity/wpa-supplicant/wpa-supplicant/0001-AP-WMM-Fix-integer-underflow-in-WMM-Action-frame-par.patch b/meta/recipes-connectivity/wpa-supplicant/wpa-supplicant/0001-AP-WMM-Fix-integer-underflow-in-WMM-Action-frame-par.patch
new file mode 100644
index 00000000000..882674fe5bc
--- /dev/null
+++ b/meta/recipes-connectivity/wpa-supplicant/wpa-supplicant/0001-AP-WMM-Fix-integer-underflow-in-WMM-Action-frame-par.patch
@@ -0,0 +1,45 @@
+Upstream-Status: Backport
+
+Signed-off-by: Fan Xin <fan.xin@jp.fujitsu.com>
+
+From ef566a4d4f74022e1fdb0a2addfe81e6de9f4aae Mon Sep 17 00:00:00 2001
+From: Jouni Malinen <j@w1.fi>
+Date: Wed, 29 Apr 2015 02:21:53 +0300
+Subject: [PATCH] AP WMM: Fix integer underflow in WMM Action frame parser
+
+The length of the WMM Action frame was not properly validated and the
+length of the information elements (int left) could end up being
+negative. This would result in reading significantly past the stack
+buffer while parsing the IEs in ieee802_11_parse_elems() and while doing
+so, resulting in segmentation fault.
+
+This can result in an invalid frame being used for a denial of service
+attack (hostapd process killed) against an AP with a driver that uses
+hostapd for management frame processing (e.g., all mac80211-based
+drivers).
+
+Thanks to Kostya Kortchinsky of Google security team for discovering and
+reporting this issue.
+
+Signed-off-by: Jouni Malinen <j@w1.fi>
+---
+ src/ap/wmm.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/src/ap/wmm.c b/src/ap/wmm.c
+index 6d4177c..314e244 100644
+--- a/src/ap/wmm.c
++++ b/src/ap/wmm.c
+@@ -274,6 +274,9 @@ void hostapd_wmm_action(struct hostapd_data *hapd,
+ return;
+ }
+
++ if (left < 0)
++ return; /* not a valid WMM Action frame */
++
+ /* extract the tspec info element */
+ if (ieee802_11_parse_elems(pos, left, &elems, 1) == ParseFailed) {
+ hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
+--
+1.9.1
+